"Official drawbar test no. 396. Allis-Chalmers HD 5B. 1948." Allis-Chalmers HD-5B crawler being driven on tractor test track in front of the test car, which is followed by two Load Tractors which generate the needed Drawbar Pull. The Hydraulic...

Allis-Chalmers 7580 during a drawbar test. The three tractors behind the Allis Chalmers are "load units" or "load tractors" which help generate resistance on the drawbar. The 7580 was the tallest tractor to be tested until that time and a new...

Drawbar test of the Silver King Tri-Cycle tractor. Test #250, 1936. This was the year before the Adams Test Car was put into use. The test car is using a trailer with an axle which was driven by a separate engine via a transmission. Throttling...

Drawbar Test of Minneapolis Moline 12-25, Test # 13, 1920. The test car shown is the first one (the bathtub with a roof!) used. The interesting thing is the "fifth-wheel steer" system which must have made for difficult steering with the wide axle.

Drawbar Test of John Deere L, Test#313, 1938. Tractor test on the dirt track. Th test car is the number 2 generation with the resistance trailer at the back. Apparently the Adams test car had a problem at the time.

Dodge Power Wagon T137 during the drawbar test. Test #137. The Power Wagon is towing the trat car. The Test Track at that time was still a Dirt Track. The Power Wagon had 4-wheel drive, a PTO and a low gear range and was supposed to be able to do...

"Caterpillar D8 being during drawbar test at Nebraska tractor test station." The Caterpillar The D8 tractor is towing the Adams test car and two side-by-side rows of load tractors. A special hitch system was built to tow two parallel rows. A...

Leyland 245 tractor during the drawbar test #1177, 1975. This was one of the first tests with a fuel heater for diesel fuel (visible on the front). The fuel heater was used to simulate the fuel temperature in the tractor tank after about two hours...

Oliver 1800 Mechanical Front wheel Drive (MFWD) tractor from test 832 during the drawbar test. The tractor is towing the Oliver test car and load units. It is not clear why there are wheel counters on the rear AND the front wheels, since the gear...

Oliver 1550 tractor during the drawbar test #944. The tractor is on the test track towing the Oliver tractor test car. Note the oramge fuel tank which was weighed before and after each continuous run test (2 hrs or 10 hrs) at the time.

Steiger tractor with the Oliver test car during the Drawbar test. The bulding in the background is the Splinter laboratory Building which houses the Tractor Test lab. The main exhaust fan can be seen on top of the building. On top of the Adams Cab...

Steiger tractor pulling the Oliver test car and two other load tractors during the drawbar test. Note the auxilliary Fuel Tank on the Adams instrument control cab of the test car. Trctor model cannot be identified.

"Steiger-Tiger Drawbar Test at Lincoln Airport The Steiger Tiger III ST-450 Test #1282. The tractor tows the Oliver tractor test car and three other tractors. All the equipment is parked he test area is the concrete apron area at the Lincoln...

Fish-Eye view of Steiger Tiger III ST450 drawbar test (#1282, 1978) at the Lincoln Airport. The ST450 is towing he Oliver Test Car plus 2 other Steiger units as load tractors. The airport apron area was leased from the Airport Authority for this...